Violation
In periodontal therapy, “guided tissue regeneration” is most successful in treating 1. horizontal bone loss. 2. a 3-walled infrabony defect. 3. a mandibular Class III furcation involvement. 4. a mandibular Class II furcation involvement
(1) and (3)
(2) and (4)
(1) (2) (3)
All of the above.
(4) only